You should install the latest drivers for your video card, being sure to uninstall the old drivers first. If you already have the latest drivers, you should completely uninstall the drivers and then reinstall them. This fixes most problems. If the game still doesn't work, it may be that your video card does not have the minimum features required. Please check the readme for more information, including a list of supported video cards.

Even though it says what to do, I still don't get wtf it's saying... Yeah, someone help.. I'm an idiot.

Important Note: some 3D accelerator cards with the chipsets listed here may not be compatible with the 3D acceleration features utilized by Call of Duty; please refer to your hardware manufacturer for 100% DirectX 9.0b compatibility

For this computer, I got an NVIDIA GeForce 4 MX (64 MB DDR) for free. But, on the other computer, we bought a Radeon 7500 for like, $75. It's a pretty good video card, it was able to run Final Fantasy XI quite smoothly, so I would imagine it could run a lot of other recently made games.

Now you could probably find it for $50. And make sure you or someone you know knows how to install a new video card.

To buy a state-of-the-art video card would cost you well over THREE HUNDRED dollars. Fifty dollars really isn't that much, especially since you're going to need it to play just about any game made after 2002.

About the minimum you should be looking at is a 9600Pro Radeon, or a FX5700 Nvidia card. There would be little sense buying a video card this week and finding yourself 'out of it' (or where you are now) in 6 months.
You usually get EXACTLY what you paid for, how many $299 'specials' do you think come with a $150 video card?

Well, if everything on your computer needs to be upgraded, you might as well. But if you REALLY just need only a new video card...there really isn't any point in spending $700+ dollars on a decent computer.